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Thread: Graziano SAG 180 bed wear
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24th Jul 2022, 11:17 PM #1Most Valued Member
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Graziano SAG 180 bed wear
I've just bought a Graziano lathe, SAG180, but the bed ways has approx .2mm bed wear near the chuck. https://metalworkforums.com/f65/t198337-graziano-lathe This has only taken me 7 years to get it.
https://metalworkforums.com/f65/t136...iano-sag-180-a submitted by the previous owner.
I'm looking at getting it refurbished/reground when it gets here, would it require the saddle machined also?
Also has anyone had the speed information plate replaced, and how was it done?
Pics will be taken of it when I get it here.
Thanks In Advance,
KrynTo grow old is mandatory, growing up is optional.
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25th Jul 2022, 09:32 AM #2Diamond Member
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Australian FB scraping group.
https://www.facebook.com/groups/1242191559496575
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25th Jul 2022, 12:34 PM #3I break stuff...
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Without trying to be rude, if you're asking that question, you're in way over your head and should reconsider this project.
The short answer is yes, but it's really not that simple. If you simply hack out the worn bits under the saddle, the whole saddle drops, and the alignment of the leadscrew and feed rods goes out - and especially with the amount of material you'll need to remove that will be a problem (I'd guess the wear in the soft cast iron saddle is double the wear in the bed at a minimum).
What it needs is to be machined out, then built back up with Turcite, Moglice, or some other suitable method, then usually scraped to fit (not always with some of the previous when poured in place). This way you can also avoid having to machine down either the section under the saddle where the retaining clamps go (stop the saddle lifting under load), or surface grinding big steps into the clamps to get the clearance right.
Then of course, the cross slide ways on the saddle will be worn deeper on the chuck side, so you'd want to address that since you've gone this far, otherwise the compound will be heading downhill when you have it swung around, which will give you frustrating results if using the compound.
And if it has that much wear, the tailstock ways will probably also be flogged, so you'd be mad not to have them done while it's on the grinder. Meaning also the tailstock base needs machining + scraping, and then you need to raise the rest of the tailstock body back up to spindle centre height somehow. And while you're at it, the bore of the tailstock will probably be sloppy as hell (mine definitely is), so best to rebore the body, and potentially make a new quill...
This is not a small or quick job you're talking about undertaking, this is a thousands of dollars and many hours of time type thing, not only the grinding/machining, but investment in surface plates, scraping gear, measuring gear and the time to acquire the knowledge and practise to get it right.
Otherwise just use it as is and learn to work around the wear just grinding it and machining the underside of the saddle alone is a waste of effort and money, and may well make the machine WORSE to use. And in my personal opinion on something like a SAG 180 is more like outright butchery...
Bit like buying a Ferrari with a worn engine, minimal brakes left, flogged suspension, and rust holes in the floor, throwing in a 4ac carby motor from the old Toyota Sprinter and calling it done. Sure it works, and it moves around - but has none of the original abilities that made it a Ferrari in the first place.
Spindle speeds, or feeds and speeds? They were originally screen printed from looking at mine. I have a file on a computer somewhere around here with the reconstructed feeds and speeds plate for mine on it, which should be the same as Bryans machine from memory (early type, levers marked ABC and 1-6, instead of ABCD and 1-10). I was going to look into getting it laser marked (as opposed to engraved) as the closest match to screen printing, and in the hope that I could also get all the holes laser cut at the same time. Haven't got to it yet (Very annoying having to go dig up the old mangled plate from a shelf when threading), so not 100% the size is exactly right, but I think it's very close.
Spindle rpm is the same thing, but you'll have to make your own artwork up. I can supply a photo of the speeds on mine, but I seem to recall Bryans was plain bearing, so might be different. Could be getting confused with another member SAG180 though.
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25th Jul 2022, 07:22 PM #4Most Valued Member
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Thanks for the replies Bob and J&H. Will consider it more when it gets here.
Regards,
KrynTo grow old is mandatory, growing up is optional.
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25th Jul 2022, 08:59 PM #5Diamond Member
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I would set it up and use it before committing to a rebuild, My VDF lathe has more wear that that and i can still get good results.
Getting it reground will be an expensive exercise, + freight to the east coast.
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25th Jul 2022, 10:49 PM #6Member
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27th Jul 2022, 11:23 PM #7Golden Member
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